We updated the design of this site on December 18, 2017. Learn more.
ClinicalTrials.gov
ClinicalTrials.gov Menu

Towards Worldwide Comparability of Visual Acuity Assessment (VisComp)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT01312662
Recruitment Status : Unknown
Verified March 2011 by University Hospital Tuebingen.
Recruitment status was:  Recruiting
First Posted : March 11, 2011
Last Update Posted : March 11, 2011
Sponsor:
Collaborator:
Information provided by:

Study Description
Brief Summary:
Purpose of this study is to investigate the agreement, the test-retest reliability of three established and widely used visual acuity tests, to develop a mathematical transformation routine between the results from these three tests, to assess the examinees´ and examiners´ acceptance and to compare the test durations.

Condition or disease
Comparison of Visual Acuity Tests. ETDRS. FrACT. Landolt Rings.

Detailed Description:

Assessment of distant visual acuity is the most frequently used procedure for estimation of visual performance. However, there exist a vast number of markedly differing visual acuity tests worldwide; furthermore there are differing report formats to express acuity. This variety may critically interfere with standardization and comparability of this basic visual test method.

Purpose of this study is to investigate the agreement, the test-retest reliability of three established and widely used visual acuity tests, i.e., the Early Treatment Diabetic Retinopathy Study (ETDRS) visual acuity charts, a conventional projected distant visual acuity test according to DIN 58220 part 3, and the Freiburg visual acuity test (FrACT), to develop a mathematical transformation routine between the results from these three tests, to assess the examinees´ and examiners´ acceptance and to compare the test durations.


Study Design

Study Type : Observational
Estimated Enrollment : 84 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: Towards Worldwide Comparability of Visual Acuity Assessment A Pilot Study Comparing ETDRS Visual Acuity Charts, Projected Landolt Charts and the Freiburg Visual Acuity Test (FrACT) With a View to Developing a Mathematical Transformation Routine Between the Results From These Three Tests
Study Start Date : March 2011
Groups and Cohorts

Group/Cohort
normal ophthalmological status
opacity of the refractive media
maculopathy
optic neuropathy
chiasmal and postchiasmal visual pathway pathologies
amblyopia (deprivation)
amblyopia (strabism)


Outcome Measures

Eligibility Criteria

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
University eye Hospital Tuebingen
Criteria

Inclusion Criteria:

Clinical diagnosis of:

  • normal ophthalmological status,
  • opacity of the refractive media,
  • maculopathy,
  • optic neuropathy
  • chiasmal and postchiasmal visual pathway pathologies,
  • amblyopia (deprivation),
  • amblyopia (strabism)

Exclusion Criteria:

  • underage person
  • concomitance of different eye-diseases
Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01312662


Contacts
Contact: Felix Tonagel, MD ResearchGroupVisualPathway@googlemail.com

Locations
Germany
Institute for Ophthalmic Research, University of Tuebingen Recruiting
Tuebingen, Germany, 72076
Contact: Felix Tonagel, MD       ResearchGroupVisualPathway@googlemail.com   
Sponsors and Collaborators
University Hospital Tuebingen
University of Freiburg
More Information

Responsible Party: Prof. Dr. med. Schiefer, Institute for Ophthalmic Research, University of Tübingen
ClinicalTrials.gov Identifier: NCT01312662     History of Changes
Other Study ID Numbers: VisComp01
First Posted: March 11, 2011    Key Record Dates
Last Update Posted: March 11, 2011
Last Verified: March 2011